ApplicationLanguageSwitcher.h

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#ifndef APPLICATIONLANGUAGESWITCHER_H
#define APPLICATIONLANGUAGESWITCHER_H

#include <functional>

#include "core/common/ESingleton.h"
#include "core/ApplicationLanguageManager.h"

class ApplicationLanguageManager;

class OnLeavingScope
{
public:
    using OnLeavingScopeFunction = std::function<bool()>;

    OnLeavingScope( const OnLeavingScope & ) = delete; // prevent copying
    OnLeavingScope &operator=( const OnLeavingScope & ) = delete;

    OnLeavingScope( const OnLeavingScopeFunction &f ) : mFunction( f ) {}
    ~OnLeavingScope()
    {
        mFunction();
    }

private:
    OnLeavingScopeFunction mFunction;
};

class ApplicationLanguageSwitcher : public ESingleton <ApplicationLanguageSwitcher>
{
public:
    bool SetDefaultTemporaryLanguage();

    bool ResetTemporaryLanguageToGlobal();

private:
    ApplicationLanguageSwitcher();
    virtual ~ApplicationLanguageSwitcher();
    bool SetApplicationLanguageManagerInstance( ApplicationLanguageManager *applicationLanguageManager ); // ApplicationLanguageManager is responsible for instance creation and correct initialization

    friend class ESingleton<ApplicationLanguageSwitcher>;
    friend class ApplicationLanguageManager;

    class DataClass;
    QScopedPointer<DataClass> d;
};

// by using this define it is possible to set default (startup) language as temporary language without obligation to manually reset language to global language (reset to global language is called automatically, when usage of this define gets out of scope)
#define SET_DEFAULT_TEMPORARY_LANGUAGE_WHILE_IN_SCOPE \
    ApplicationLanguageSwitcher::GetInstance().SetDefaultTemporaryLanguage(); \
    OnLeavingScope scope( [](){ return ApplicationLanguageSwitcher::GetInstance().ResetTemporaryLanguageToGlobal(); } );

#endif // APPLICATIONLANGUAGESWITCHER_H